Phlox plant named ‘Sunphlosiro’

ABSTRACT

A new and distinct cultivar of  Phlox  plant named ‘Sunphlosiro’, characterized by its compact and mounding plant habit; vigorous growth habit; freely branching and flowering habit; long flowering period; white-colored flowers; and good garden performance.

Botanical designation: Phlox drummondii.

Cultivar denomination: ‘SUNPHLOSIRO’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Phlox plant, botanically known as Phlox drummondii and hereinafter referred to by the name ‘Sunphlosiro’.

The new Phlox plant is a product of a planned breeding program conducted by the Inventor in Higashiomi, Shiga, Japan. The objective of the breeding program was to create new compact, mounding and freely branching Phlox plants with attractive flower coloration.

The new Phlox plant originated from a cross-pollination made by the Inventor in July, 2006 in Higashiomi, Shiga, Japan, of a proprietary selection of Phlox drummondii identified as code number 6Ph-16a, not patented, as the female, or seed, parent with a proprietary selection of Phlox drummondii identified as code number 0Ph-32a, not patented, as the male, or pollen, parent. The new Phlox plant was discovered and selected by the Inventor as a single flowering plant within the progeny of the stated cross-pollination in a controlled greenhouse environment in Higashiomi, Shiga, Japan in May, 2007.

Asexual reproduction of the new Phlox plant by cuttings in a controlled greenhouse environment in Higashiomi, Shiga, Japan since June, 2007 has shown that the unique features of this new Phlox plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Phlox have not been observed under all possible environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature and light intensity without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘Sunphlosiro’. These characteristics in combination distinguish ‘Sunphlosiro’ as a new and distinct Phlox plant:

-   -   1. Compact and mounding plant habit.     -   2. Vigorous growth habit.     -   3. Freely branching and flowering habit.     -   4. Long flowering period.     -   5. White-colored flowers.     -   6. Good garden performance.

Plants of the new Phlox differ from plants of the female parent selection primarily in plant habit plants of the female parent selection are more compact than plants of the new Phlox. In addition, plants of the new Phlox are more heat tolerant than plants of the female parent selection.

Plants of the new Phlox differ from plants of the male parent selection primarily in flower size as plants of the male parent selection have smaller flowers. In addition, plants of the new Phlox are smaller than plants of the male parent selection.

Plants of the new Phlox can be compared to plants of Phlox drummondii ‘Sunphloho’, disclosed in U.S. Plant Pat. No. 16,724. In side-by-side comparisons conducted in Higashiomi, Shiga, Japan, plants of the new Phlox and ‘Sunphloho’ differed in the following characteristics:

-   -   1. Plants of the new Phlox were smaller and had shorter         internodes than plants of ‘Sunphloho’.     -   2. Plants of the new Phlox were not as upright as plants of         ‘Sunphloho’.

Plants of the new Phlox can be compared to plants of Phlox drummondii ‘Sunphloconsa’, disclosed in U.S. Plant Pat. No. 20,897. In side-by-side comparisons conducted in Higashiomi, Shiga, Japan, plants of the new Phlox and ‘Sunphloconsa’ differed in the following characteristics:

-   -   1. Plants of the new Phlox were shorter than plants of         ‘Sunphloconsa’.     -   2. Plants of the new Phlox were more freely flowering than         plants of ‘Sunphloconsa’.     -   3. Plants of the new Phlox and ‘Sunphloconsa’ differed in flower         color.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new Phlox plant showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Phlox plant.

The photograph at the top of the sheet comprises a side perspective view of a typical flowering plant of ‘Sunphlosiro’ grown in a container.

The photograph at the bottom of the sheet is a close-up view of a typical flowering plant of ‘Sunphlosiro’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations, measurements and values describe plants grown during the late spring in 15-cm containers in an outdoor nursery in Higashiomi, Shiga, Japan and under commercial cultural practices. During the production of the plants, day temperatures averaged 25° C. and night temperatures averaged 15° C. Plants were seven months old when the description and photographs were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2001 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Phlox drummondii ‘Sunphlosiro’. -   Parentage:     -   -   Female, or seed, parent.—Proprietary selection of Phlox             drummondii identified as code number 6Ph-16a, not patented.         -   Male, or pollen, parent.—Proprietary selection of Phlox             drummondii identified as code number 0Ph-32a, not patented. -   Propagation:     -   -   Type.—By cuttings.         -   Time to initiate roots.—About two to three weeks at 20° C.             to 25° C.         -   Time to produce a rooted young plant.—About one to two             months at 20° C. to 25° C.         -   Root description.—Fibrous; white in color.         -   Rooting habit.—Freely branching; medium density. -   Plant description:     -   -   Plant and growth habit.—Compact and mounding plant habit;             vigorous growth habit; freely branching habit with lateral             branches potentially developing at every node; pinching             enhances lateral branch development.         -   Plant height.—About 13.4 cm.         -   Plant width (spread).—About 30.4 cm.         -   Lateral branches.—Length: About 15 cm. Diameter: About 2 mm.             Internode length: About 1.2 cm. Strength: Strong. Texture:             Pubescent. Color: Close to 145A. -   Foliage description:     -   -   Arrangement.—Alternate, simple; sessile.         -   Length.—About 4.6 cm.         -   Width.—About 1.3 cm.         -   Shape.—Narrowly elliptic.         -   Apex.—Acute.         -   Base.—Obtuse.         -   Margin.—Entire.         -   Texture, upper and lower surfaces.—Pubescent.         -   Venation pattern.—Pinnate, reticulate.         -   Color.—Developing and fully expanded leaves, upper surface:             Close to 137B; venation, close to 145C. Developing and fully             expanded leaves, lower surface: Close to 138B; venation,             close to 145C. -   Flower description:     -   -   Flower arrangement and habit.—Single rotate flowers arranged             in terminal and axillary cymes; flowers face mostly upright;             cymes roughly hemispherical in shape; freely flowering habit             with about 89 flowers per plant.         -   Fragrance.—Present, pleasant.         -   Natural flowering season.—Plants begin flowering about one             month after planting; plants flower continuously from spring             to autumn in Japan.         -   Postproduction longevity.—Flowers last about five days on             the plant; flowers not persistent.         -   Flower buds.—Height: About 1.9 cm. Diameter: About 3.4 mm.             Shape: Clavate. Color: Close to 150D.         -   Inflorescence height.—About 2.7 cm.         -   Inflorescence diameter.—About 5.3 cm.         -   Flower diameter.—About 2.7 cm.         -   Flower depth.—About 1.7 cm.         -   Tube length.—About 1.4 cm.         -   Tube diameter, base.—About 1.8 mm.         -   Petals.—Quantity per flower: Typically five in a single             whorl; petals fused at the base into a narrow tube. Length:             About 1.3 cm. Lobe width: About 1.4 cm. Shape: Broadly             ovate. Apex: Broadly acute. Margin: Entire. Texture, upper             and lower surfaces and throat: Smooth, glabrous. Texture,             tube: Pubescent. Color: Developing and fully expanded             petals, upper surface: Close to N155A. Developing and fully             expanded petals, lower surface: Close to N155A. Throat:             Close to 150D. Tube: Close to 150D.         -   Sepals.—Quantity per flower: Typically five in a single             whorl, fused towards the base; calyx star-shaped. Length:             About 7.8 mm. Width: About 1.8 mm. Shape: Lanceolate. Apex:             Acute. Margin: Entire. Texture, upper and lower surfaces:             Smooth, glabrous. Color, developing and fully expanded             sepals, upper surface: Close to 137B. Color, developing and             fully expanded sepals, lower surface: Close to 137C.         -   Peduncles.—Length: About 9 mm. Diameter: About 1 mm.             Strength: Strong. Texture: Pubescent. Color: Close to 145A.         -   Pedicels.—Length: About 6 mm. Diameter: About 0.8 mm.             Strength: Strong. Texture: Pubescent. Color: Close to 145B.         -   Reproductive organs.—Stamens: Quantity per flower: Typically             five. Stamen length: About 7 mm. Anther shape: Lanceolate.             Anther size: About 2.5 mm by 0.8 mm. Anther color: Close to             3A. Pollen amount: Moderate. Pollen color: Close to 6A.             Pistils: Quantity per flower: One. Pistil length: About             3.5 mm. Stigma shape: Three-parted. Stigma color: Close to             145C. Style color: Close to 145C. Ovary color: Close to             143C.         -   Seeds and fruits.—Seed and fruit development have not been             observed on plants of the new Phlox. -   Disease & pest resistance: Plants of the Phlox have not been     observed to be resistant to pathogens and pests common to Phlox. -   Garden performance: Plants of the new Phlox have been observed to     have good garden performance and to tolerate rain, wind and     temperatures ranging from about 0° C. to about 35° C. 

It is claimed:
 1. A new and distinct Phlox plant named ‘Sunphlosiro’ as illustrated and described. 